Ultra Mont Blanc Carbon Review: A Zero-Drop Ultra Marathon Racer

Introduction

The Ultra Mont Blanc Carbon is one of Ultra’s first plated semi-super shoe racing shoes for the trail. It’s an evolution of the original Mont Blanc, keeping what people liked and adding super shoe elements: a Carbotex plate and Ultra Eagle Pro midsole foam, which we’ve been told is PEBA-based, though it doesn’t necessarily feel exactly like that in practice.

This is a very expensive shoe at $260. After putting serious mileage on it, including a trail long run, trail tempo and fartlek work, and a few road miles just to test it, one thing is clear: its real purpose is ultramarathon distance, not short-distance speed.

Who This Shoe Is For

At its core, this is a shoe designed to feel good when the miles keep stacking up. If your goal is an ultra and you want a zero-drop, anatomic fit with a plate underfoot, this is squarely aimed at you.

If you’re looking for the snappiest, bounciest ride for shorter distances, this probably isn’t it, unless you specifically want a zero drop, an anatomic fit, and a more forgiving plate. The shoe changes its function depending on what you ask of it, which makes it versatile: pick up the pace and it responds well, settle into a consistent slower pace and it handles that well too.

Main Strengths

The specs tell part of the story. A men’s size 10 (women’s size 11.5) weighs 9.6 oz (272 g), with a 29 mm heel and 29 mm forefoot stack for a 0 mm drop. The Carbotex plate has some flexibility to it, so it’s not the stiffest plate on the market. When running easy, that flexibility feels nice, and the plate really only makes itself known when you pick up the pace.

The Eagle Pro midsole doesn’t feel dramatic at an easy pace, but over really long distances it shines. Legs feel less tired, and the ride keeps extending outward, which is exactly what this kind of foam is meant to do. The super shoe feel only really kicks in at speed on flat ground or downhill, when you slam and compress the foam and get that bounce. Uphill, you don’t feel it much.

The fit also rewards long efforts: the longer you go, the better it feels, especially once your feet swell into the volume. It fits almost exactly the same as the Ultra Temp 5, with a wider heel, minimal heel counter, and a gaiter-friendly design that locks down nicely.

Things to Consider Before Buying

The upper is where things get tricky. Some people complained about heel slip in the original Mont Blanc, and it’s still there. Locking the shoe down requires careful lace locking, and the shoe feels about half a size long. Early miles can feel clunky and awkward at toe-off, and it only settles in once feet swell on longer runs.

If you want a shorter distance shoe and like all these features, consider going half a size down with thinner socks. For longer distances, stay true to size, since you’ll swell into the shoe and appreciate the room later in the miles.

Traction and durability have held up well. The Vibram outsole has lasted nicely over almost 40 miles of mostly trail use, though a few road miles did tear into the exposed Eagle Pro foam. Grip is fairly average: fine for gravel, dirt, and even some road, but it’s not built for super technical terrain or deep mud.

Buying Advice

At $260, the price is a little higher than it needs to be. A more responsive foam and a slightly higher stack height would go a long way. But the shoe is genuinely unique: a slightly flexible plate, a zero-drop anatomic midsole, and plenty of foam underfoot for really long distances.

If those qualities match what you need for ultra racing, it may be worth the spend. It competes against a few other trail super shoes and sits on the lower end weight-wise, so a direct comparison is worth doing before you commit.

Conclusion

The Ultra Mont Blanc Carbon is best understood as an ultramarathon shoe, and a good one. It’s not the liveliest ride for short efforts or technical terrain, and the long fit takes some management, but for big-mile days on traditional trail surfaces it does its job well and keeps encouraging you to keep going.